of chicago



Nov. 9 1926.

J. MaGGREGOR HYPODERMIC SYRINGE Filed Sept. 15. 1924 fla/@127i kfoin /acG'fgoz? Patented Nov. 9, 1926.

UNITED .STATES PATENT"A oFFlcE.

JOHN MACGREGOR, F CHICAGO, ILLINOIS, ASSIGNOR 'IOl COOK LABORATORIES,INC.,

OF CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE. 'I

HYPoDRMIe sYnINen.

Application led September 15, 1924. Serial No. 737,636.

This invention relates to hypodermic syringes of the type employing amedicament-dispensing cartridge as the medicament container, and amongother objects aims to provide a Syringe exceptionally easy to fill withsuch a cartridge.

The invention may be understood by reference to one illustrativeembodiment shown in the accompanying drawings, in

which:

Fig. 1 is an elevation of the syringe;

Fig. 2 is an enlarged longitudinal cross section thereof; and

Fig. 3 is an elevation of the principal parts of the syringe shown openfor filling.

It is to be understood that the illustrative form shown in the-drawingsis simply a preterred embodiment of the invention; and that in thefollowing explanation of that specific form, the described details ofstructure and organization are merely exemplary.

rIhe syringe shown comprises 'a skeleton barrel or body 5 to which atubular cartridge carrier member 6 is swingably connected in. termediateits length by rivets 7. When the barrel is closed, as shown in `Fig. l,the carrier member is axially alined with the barrel, and its ends lieadjacent the barrel heads 8 and 9. The barrel head 8 supports thehypodermic needle 10, while the barrel head 9V slidably receives thesyringe plunger rod 11 which contracts the interior volume of thecartridge 12 to dispense its contents through the needle. To lill thesyringe, the carrier 6 is swung on its pivots, as shown in Fig. 3, thuspresenting eitheir of its ends in convenientl position for insertion ofa fresh cartridge.

To hold the barrel closed, the barrel head 9 carries a lock 13 in theform of a slidable, hollow sleeve, normally projected outwardly from thebarrel head by a spring 14. The lock is designed to ft in one end of thepivoted cartridge carrier to keep it alined with the plunger, so thatthe inner enlarged end 15 of the plunger rod may push the slidable plug16 of the cartridge to inject the medicament, AS shown, the plunger end15 engages with a recess 17 in the sleeve lock, permitting disengagementof the lock by an outward pull on the plunger rod. When the cartridge is'within the locked carrier, the outer edge of the Sleeve lock pressesthe cartridge resiliently toward the needle (Fig. 2), thus preventing anobjectionable lo'oseness of assembled parts, as will be explained below.

In the construction shown, the carriery is pivoted midway its-ends andmidway the barrel heads 8, 9 so that the carrier may be swung in eitherdirection in opening or closing the syringe. As best shown in Fig. 3,the end edges of lthe tube which forms the carrier may be out away onopposite sides as at 18, so that when the carrier is moved toward closedposition, its cut-away edge cams the sleeve lock, which yields to thecarrier. Such a construction permits the syringe to be snapped shutwithout manipulatingA the lock.

Before using the syringe, the carrier 6 is unlocked and swung'outwardly, as shown in Fig. 3, and the cartridge is inserted in eitherend. Then the `carrier is moved into longitudinal alinement with thebarrel, whereupon the lock automatically Snaps shut, as described.Lastly, the cartridge plug 19 is pierced by a longitudinal thrust of theneedle, which then provides a medicament conduit leading from theinterior of the cartridge to the point of injection. The syringe is `nowready for service,

When the syringe is used, the plunger 11. pushes the slidable plug 16through the cartridge, ejecting the medicament through the fine bore ofneedle 10; Due to the large ratio of the diameter of the slidable plugto the bore of the needle, a small movement of the former causes a rapidflow through the latter, whose iow capacityis very 1imited; and theresultant fluid pressure within the cartridge is sutlicient to tend toeject plug 19, which would cause loss of the medicament and fouling ofthe syringe. In the arrangement shown, the sprmg-pressed latch 13presses the cartridge rmly against the syringe head 8, thus adding there sistance of the spring 14 to the frictional grip of plug 19 withlnits tube; and these two resistances are usually sullicient to preventpositively any outward movement of plug 19.

Obviously the present invention is not restrieted to the particularembodiment thereof herein shown and described. Neither is itindispensable that all the features of the invention be used conjointly;they may be combination, a skeleton barrel; a cartridge holder pivotedintermediate its ends to an intermediate point of said barrel and openat one end for insertion of the cartridge; and means for locking thecartridge holder tothe barrel when coaxial therewith.

2. A hypodermic syringe comprising, in combination, a supporting body; acartridgeenclosing member pivoted to the body to swingv about atransverse axis between its ends,botl1 of which are open for insertionof the cartridge, and a latch serving to lock the cartridge-enclosingmember in axial alinement with the body. f.

3. A hypodermic syringe comprising, in combination, a body; and acartridge carrying member pivoted to the body and open at one end forready insertion or removal of the cartridge; the parts being soconstructed and arranged that the carrying member may be swung orrotated on its pivots but is otherwise immovable relative to the body.

4. A hypodermic syringe comprising, in combination, a bod and acartridge carryingmember pivote to the body and open at vone end forready insertion or removal of the cartridge; and a spring latch carridby the body orlocking the cartridge-enclosing member in a positionpermitting dispensing of the medicament therefrom.

5. A hypo'dermic`syringe comprising, in combination, a skeleton barrel;a cartridge holder pivoted intermediate its ends to said barrel andconstructed and arranged to enclose a cartridge placed therein; aplunger slidable through one end of the barrel to dispense medicamentfrom the cartridge; an a latch for holding together the barrel andcartrid e holder, said latch being released by pu ing on the plunger.

6. A hypodermic syringe comprising, in combination, a skeleton barrel; acartridge holder carried by the barrel and constructed and arranged topermit insertion of a cartridge therein from one end; and a spring latchcarried by the barrel and fitting into one end of the cartrid e holder;the parts being so constructed an arranged that when the cartridge is inthe holder and the latch is engaged, the cartridge is pressed againstthe other end of the barrel by. thespring latch.

7. A hypodermic syringe comprising, in combination, a barrel; acartridge holder carried by the barrel; the barrel and cartridge holderbeing relatively movable to permit insertion of a cartridge from eitheren'd of the holder; and a plunger carried by the barrel for dispensingmedicament from the cartridge.

8. A hypodermic syringe comprising, in combination, a rigid, skeletonbarrel having heads at opposite ends; a` cartridge holder, tubular inform, pivoted at an intermediate point to the barrel and swingableoutwardly therefrom :tor insertion of a cartridge; a hypodermic needle;means securing said needle to one of the barrel heads to extendtherethrough in position to pierce one end of the cartridge; alatch-carried by the oppo-site barrel head and constructed and arrangedto engage the cartridge holder to retain it coaxial with the barrel; anda medicament-dispensing plunger slidable through said opposite head. v

9. A hypodermic syringe comprising, in combination, a rigid skeletonbarrel having heads at opposite ends; and a tubular, openended cartridgeholder pivoted intermediate its ends to the skeleton barrel and ttingwithin fthe barrel when swung into axial alinement and presenting eitherend for lling with a cartridge when swung out of alinement with thebarrel.

10. A hypodermic syringe comprising, in combination, a skeleton barrel;a tubular cartridge holder pivoted midway its ends to said barrel; aspring lock carried by the barrel and constructed and arranged to engagewith either end of the cartridge holdenwhen co-axial with the barrel;the end edges of said cartridge holder being cut away so .that wheneither end is swung toward the lock from either direction, the edge ofthe holder cams the lock which snaps ahut automatically.

11. A hypodermic syringe comprising, in combination, a rigid skeletonbarrel includinghea'ds at opposite ends and tie members connecting theheads; a tubular cartridgeenclosing member pivoted between the tiemembers at a point midway between the ends thereof and of the tiemembers, and freely swingable but otherwise immovable relative vto thebarrel; a manually operable latch carried by one of the syringe headsand projectable across the joint between said head and an end of thecartridge-enclosing member so as to extend a short distance within saidmember; a medicament-dispensing cartridge held in place by said latch;and means on the other lsyringe head for-supporting a needle incartridge-piercing position.

12. A hypodermic syringe comprising, in combination, a rigid skeletonbarrel including heads at opposite ends and tie members connecting theeads; a tubular cartridgeenclosing member pivoted between the tiemembers at a point midway between the ends thereof and of the tiemembers, and freely swingable but otherwise immovable relative tothebarrel; a spring pressed sleeve lock Carried by one of the syringe lockso as to Withdraw the lock from the heads and projected by the springacross the cartridge-enelosingA member when pulled joint between saidhead and an end of the outwardly. 10 cartridge-enclosing member so as toextend In testimony whereof, I'have. signed my 5 a short distance Withinthe member; a inediname to this specification.

cament dispensing plunge-r reciprocable through said head and engagingthe sleeve JOH MACGREGOR.

